Method, apparatus and system for compressing still images in multipurpose compression systems
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United States of America Patent
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Jul 3, 2007
Grant Date -
Jan 22, 2004
app pub date -
Jul 15, 2003
filing date -
Jul 16, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention teaches a method of compressing still images in a multi-purpose compression system. The current invention teaches preprocessing of the images to a YUV 4:2:0 format and decomposing the images using two-dimensional Discrete Wavelet Transformation. The current invention teaches that filters may be selected based on image dimensions. After the image is decomposed, the frequency coefficients are quantized and the data is entropy encoded. The image is restored by reversing the compression process.
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